context("plot qq") test_that("test return object", { df <- data.frame(replicate(8, rnorm(10))) plot_list <- plot_qq(df, nrow = 2L, ncol = 2L) expect_is(plot_list, "list") expect_equal(names(plot_list), c("page_1", "page_2")) expect_true(all(vapply(plot_list, is.ggplot, TRUE))) })